endophytic bacteria from pinus taeda l. as biocontrol agents of fusarium circinatum nirenberg & o'donnell bacterias endófitas de pinus taeda l. como agentes de control biológico de fusarium circinatum nirenberg & o'donnell

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ID: 229707
2012
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Abstract
Fusarium circinatum Nirenberg & O'Donnell, the pitch canker fungus, has been recently reported in Uruguay affecting Pinus taeda L. seedlings. The spread of this pathogen to plantations constitute a risk to forestry production. The aim of this work was to evaluate the inhibitory effect of live bacteria and their thermostable metabolites on F. circinatum growth in vitro. Four Bacillus subtilis strains and one of Burkholderia sp. isolated as P. taeda endophytes were evaluated as biological control agents of F. circinatum. Dual cultures between live bacteria and pathogen were performed. Furthermore, bacteria metabolites obtained from liquid cultures were sterilized and added to the culture media where fungus was grown. In this study all bacteria showed an antagonist effect on the pathogen growth arresting the mycelia at one cm of the edge of the bacteria colony. Bacteria thermostable metabolites reduced over 50% fungal growth. These results demonstrates that endophytic bacteria, well adapted to live in host tissues, constitute a good alternative to control F. circinatum affecting Pinus seedlings.
La presencia de Fusarium circinatum Niremberg & O'Donnell, agente causal del cancro resinoso en pino, ha sido detectada recientemente en plántulas de Pinus taeda L. en Uruguay. La propagación de este patógeno en las plantaciones constituye un riesgo para la producción forestal. El objetivo de este trabajo fue determinar la capacidad inhibitoria de bacterias vivas y de sus metabolitos termoestables sobre el crecimiento de F. circinatum in vitro. Cuatro cepas de Bacillus subtilis y una de Burkholderia sp. aisladas como endófitas de P. taeda, fueron evaluadas como potenciales agentes de control biológico sobre F. circinatum. Para ello, se realizaron enfrentamientos directos entre las bacterias vivas y el micelio del patógeno. Por otra parte, los metabolitos bacterianos obtenidos de cultivos líquidos fueron esterilizados en autoclave y se incorporaron al medio de cultivo donde se hizo crecer el patógeno. En este estudio todas las bacterias mostraron un efecto antagónico sobre el crecimiento del patógeno, deteniéndose el avance del micelio a 1 cm del borde de la colonia bacteriana. Los metabolitos termoestables de las bacterias produjeron una disminución significativa en la tasa de crecimiento del hongo mayor al 50%. Estos resultados muestran que las bacterias que viven dentro de los tejidos sanos del hospedante son una buena alternativa para el control del patógeno F. circinatum en plántulas de Pinus.
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soria2012chileanendophytic Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Silvina Soria;Raquel Alonso;Lina Bettucci
Journal journal of molecular cell biology
Year 2012
DOI
DOI not found
URL
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200018
Keywords
biological control bacillus sp cancro resinoso

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